Converting VirtualBox .VDI .VHD .VMDK to BOOTABLE .iso file - virtualbox

Question

The title is pretty much describe it all.
I thought it would be an extremely easy task but I'm googling the topic for a few days and can not find a proper solution.
I succeed convert it to .iso but it's not BOOTABLE from physical machine.
I have tried :
VBoxManage clonehd file.vdi output.iso --format RAW
I have tried :
VBoxManage clonemedium --format RAW gangina.vdi gangina.img
I have tried :
qemu-img convert -f vpc -O raw gangina.vhd gangina.raw
I have also tried to mount the bootable vdi file and :
sudo dd if={mountedDirectory} of=gangina.iso status=progress
unfortunately none of them is actually bootable from physical machine.
I'm sad :(

Answer 1

You cannot DD with a mounted directory.
You can dd the partition, but it would work better to dd the entire drive
example: dd sudo dd if={/dev/sda} of=filename.iso status=progress
i am assuming you are on a linux machine, but when you get it write to a usb and plug it in and boot it. i have used this method before with much success!
while you can do just a partition say sda1 or sda2 dd'ing the entire drive will achieve what you are looking for.
Keep on Keeping on

Answer 2

You can convert your bootable .VDI .VHD and .VMDK souce to BOOTABLE .iso on follow way on Linux like p.e. Ubuntu, Mint or Debian:
Convert .vdi to .img
qemu-img convert -f vdi -O raw source_image.vdi destination_image.img
Convert .vhd to .img
qemu-img convert -f vpc -O raw source_image.vhd destination_image.img
Convert
qemu-img convert -f vmdk -O raw source_image.vmdk destination_image.img